KR19980701813A - Valve assembly with improved valve seat - Google Patents

Abstract

A valve body having a first end, a second end, and a through hole defining a fluid flow passage and a wall surrounding a portion of the fluid flow passage, the fluid flow passage forming an axis coaxial with the wall. The valve element is rotatably mounted to the valve body, has an annular round sealing surface, and is rotatable about a second axis perpendicular to the first axis passing through the fluid flow passage. The valve seat assembly is positioned within the valve body for sealing engagement with the sealing surface of the valve element, the valve seat assembly is displaced axially from the second axis towards the first end of the valve body, and the valve seat assembly is made of an elastic plastic material. And an annular radially inward first surface and an annular radially outward second surface for sealingly engaging the sealing surface on the valve element, wherein an outwardly directed groove is formed in the second surface. An elastomeric bearing ring is disposed in the groove, the bearing ring having a circular cross section and having a centerline formed by a first surface passing through the center of the bearing ring perpendicular to the first axis, the valve element being in a closed position. And when no fluid pressure acts on the valve element, the engagement of the sealing surface on the valve element with the first surface on the sealing ring is a substantially annular line contact, the line contact coupling being at the second axis towards the first end of the valve body. In a second surface axially displaced from the first surface in a direction away. A retaining means for retaining the valve seat assembly is also provided in the valve body.

Description

Valve assembly with improved valve seat

Valves with rotatable valve elements such as, for example, butterfly valves are known. In certain types of butterfly valves, the valve seating sealingly coupling the disk is surrounded by a support member, which is generally elastic and when the disk is in the closed position, Apply force or pre-load to the seat surface. A typical example of such a valve seat structure is disclosed in US Pat. No. 3,642,248. In particular, the patent can be used in a butterfly valve and includes a wear ring for sealingly engaging the disk of the valve, the wear ring being provided with an annular radially outward groove, in which the wear ring is sealed to the disk. Disclosed is a sealing assembly in which an elastomeric bearing ring is applied to force a preload.

In the arrangement shown in U.S. Patent No. 3,642,248, the sealing contact between the disk periphery and the wear ring over a large area characterized by interference fit, requiring a relatively high torque to place or remove the disc.

The present invention relates to a valve having a rotatable valve element and in particular with an improved seat ring assembly.

1 is a front view of a valve according to the present invention.

2 is a cross-sectional view taken along the line 2-2 of FIG.

3 is a partial view, in which the zone is partially enlarged, showing the relationship between the valve seat and the disc when the disc is in the closed position and no fluid pressure is applied to the disc.

FIG. 4 is similar to FIG. 3 but shows a view when only the disc is exposed to fluid pressure as indicated by the arrow.

FIG. 5 is a view similar to FIG. 3, but only when exposed to the fluid pressure in the opposite direction indicated in FIG. 4.

It is an object of the present invention to provide a valve having an improved valve seat.

Another object of the present invention is to provide an improved valve seat assembly comprising a sealing ring and an elastomer bearing ring for preloading the sealing ring with the valve disc.

Still another object of the present invention is to provide a butterfly valve, when the fluid pressure is not applied to the disk, the sealing between the disk and the valve seat is achieved by almost linear contact, minimizing the torque required to position and remove the disk. It is to provide a valve seat for use.

The above and other objects of the present invention will become apparent from the drawings, the description and the appended claims.

The valve seat assembly according to the invention comprises a valve body having a first end, a second end and a through hole defining a flow flow passageway and a wall surrounding a portion of the fluid flow passage, the fluid flow passage being coaxial with the wall. The first axis is formed. The disc valve element is rotatably mounted to the valve body and has an annular round sealing surface that is rotatable about a second axis perpendicular to the first axis. The valve seat assembly is located in the valve body for sealing engagement with the disk sealing surface, the valve seat assembly being axially displaced from the second axis towards the first end of the valve body. The valve seat assembly is in sealing engagement with the sealing surface on the disk when the disk is in the closed position, has a radially inward first surface, and the sealing ring has an annular radially outward groove in the radially outward second surface. The valve seat assembly also includes an elastomeric bearing ring disposed in the groove, the bearing ring having a circular cross section and having a centerline formed by a first surface passing through the center of the bearing ring perpendicular to the first axis. When the valve element is in the closed position and there is no fluid pressure acting on the valve element, the engagement of the sealing surface on the disk with the first surface on the sealing ring is an almost annular line contact. The line contact coupling between the disk and the sealing ring lies in a second surface axially displaced from the first surface in a direction away from the second axis towards the first end of the valve body. A retaining means for retaining the valve seat assembly is also provided in the valve body. The valve seat assembly and the retaining means are insertable and removable through the first end of the valve body axially in the valve body.

The invention is described in particular with respect to wafer valves, for example butterfly valves, but the valve according to the invention has a rotatable valve element with a rounded sealing surface so that any line contact coupling with the valve seat affects the sealing. It should be understood that a quarter-turn valve may also be included.

1 and 2, the valve of the present invention, as shown selectively, protrudes outward from the side and connects the valve with a pipe flange adjacent the ear 12 disposed around the valve body 10. And a valve body 10 provided with a bolt hole 14 to enable it. The valve body 10 includes a central cylindrical portion 16, where the neck 18 and the lower boss 20 protrude, and the neck 18 and the boss 20 are diagonal to each other. It is located. The cylindrical portion 16 forms a through hole 22, which forms a fluid passage through the valve. The through hole 22 is formed of the coaxial cylindrical walls 24 and 26, and the cylindrical wall 26 has a diameter larger than the cylindrical wall 24 as shown. In the through hole 22, a valve element 28 is provided, which has a disc-shaped, annular round sealing surface 29, which valve element 28 defines a fluid flow passage formed by the through hole 22. To control the flow of fluid through it. The lower shaft 30 extends through the boring hole 32 in the boss 20. The lower shaft 30 is rotatably journaled in the boring hole 32 by means of a bushing 34 received in the counter boring hole 36 of the boring hole 32. End cap 38 is secured by bolt 40 to boss 20, and gasket 37 forms a seal.

The upper shaft 42 extends through the boring hole 44 in the neck 18. The stacked packing ring 46 supported in the counter boring hole 48 of the boring hole 44 provides a seal to prevent fluid from leaking between the neck 18 and the upper shaft 42. The packing chuck 50 is also supported by the counter boring hole 48, and the packing chuck 50 includes an O-ring 52 for sealing around the upper shaft 42. The detent compression bridge 54 with the central depression 56 is supported on the shaft 42 by means of a boring hole 58 passing through the bridge 54. The bolt 60 extends through the matching boring hole in the bridge 54 and the flange 64 protruding radially outward from the neck 18. The nut 66, which is threadedly supported by the bolt 60, obviously engages the indentation 56 and the top packing gland 50 to compress the stack of packing rings 46 and the neck 18 and shaft 42. Fluid can be tightened in order to ensure a leak-free seal.

The lower shaft 30 is fixed to the disk 28 by means of a pin 68 that is received in the first protruding dolly 70 of the disk 28. The upper shaft 42 is secured to the disk 28 in a manner known to those skilled in the art by means of a pin 72 extending through the second protruding dolly 74 of the disk 28. Thus, the disc 28 is rotatably journaled in the penetration of the valve body 10 and can be rotated 90 degrees either manually or by means of an actuator to control the fluid flow of the valve. To this end, the upper shaft 42 is provided with a ranch plane 76.

In order to influence the sealing around the disk 28, an annular valve seat assembly is provided, which is described in more detail below and is generally indicated as 78. The valve seat assembly 78 is generally indicated as 84 in the valve body 10 and filed concurrently with the present application and has the application number ＿＿＿＿＿ and the name of the valve assembly Kusmer Daniel F. And by means of a valve seat retaining assembly described in more detail in the (Appl Kusmer) application of the inventor of Francel Robert A .. The Kusmer application is hereby incorporated for all purposes.

3 to 5, it can be seen that the wall portion 26 forms a face having an annular, annularly extending radially inward groove 86. The groove 86 is intersected by a boring hole 88 (FIG. 1) axially drilled in the valve body 10. At this time, the boring hole 88 and the groove 86 form a gap in the lower portion of the groove 86. The retaining assembly 84 includes a retaining ring 92 having a peripheral surface 94, which, when supported by the valve body 10, has a peripheral surface 94 against the wall 26. The shape and size are determined so as to face inwardly the radially inward face formed. The ring 92 coincides with the groove 86, extends annularly and also has a radially outward groove 96 so that when the ring 92 is received in the valve body 10, the grooves 86 and 96 are annularly annular. To form extending channels. Ring 92 has a first side 95 provided with a notch 93 that intersects groove 86 in the manner described in more detail in the Kusmer application, wire member 98 having grooves 86 and 96. And is supported by an annular channel that effectively prevents axial movement of the ring 92 in the valve body 10. Wire member 98 generally has a first end 106 having a leg portion extending transversely to the long axis of wire member 98 at 90 °. In order to mount the ring 92 in the valve body 10, the ring 92 is disposed in the valve body 10 so that the notch 93 coincides with a gap formed in the bottom of the groove 86. The leg portion of the end 106 of the wire member 98 is then accessed through the notch 93 and placed in a pocket in the groove 86. This effectively fixes the first end 106 of the wire member 98 in the annular groove 86. The ring 92 may then be rotated away from the first end 106 in the counterclockwise direction, ie along the length of the wire member 98 (see FIG. 1). This results in screwing the wire member 98 into the channel formed by the grooves 86 and 96. When the ring 92 is rotated such that the notch 95 coincides with the pocket in the groove 86 again, the wire member 98 is completely within the channel formed by the matching grooves 86 and 96. Thus, the retaining ring 92 is effectively trapped in the valve body 10 and prevents any axial movement, ensuring that the valve seat assembly 78 is not moved by the pressure line.

Retention ring 92 has a second side 100 which is annularly extending and provided with a flange 102 protruding axially. The valve body 10 is axially oriented and includes an annularly extending flange 104, the flanges 102 and 104 facing each other. Thus, the first recess 106, which is annular, facing the axis and partly formed by the flange 104, and the second recess 108 which is formed by the flange 102, partly facing the axis, is annular have. As shown, the recesses 106 have a smaller radial width than the recesses 108, and the recesses 106 and 108 face each other. The flanges 102 and 104 also form partially annularly extending channels 110, which intersect the recesses 106 and 108 and open into the flow passages 22. Effectively, the recesses 106 and 108 and the channel 110 form a generally T-shaped annular valve seat cavity.

With reference to FIG. 3, the disk 28 is shown when the valves are in the open position together. That is, the face 29 is coupled to seal with the annular sheet surface 122 on the sealing ring (80). The sealing ring 80 is a first annular flange unit integrated with the body portion 112, which is received in the channel 110, in the central, annular elongated body portion 112 and in the recess 106. 114 and a second annular flange 116 integral with the body portion 112 receiving inwardly of the recess 108. As can be seen, the central body 112, flange 114 and flange 116 are spaced by valve seat cavities defined by channels 110, recesses 106 and recesses 108, respectively. Size and shape are determined to fit without.

In the embodiment shown in FIG. 3, that is, when the disk 28 is in a position to close to seal the sealing ring 80 and there is no pressure acting on the disk 28, the disk 28 and the sealing ring 80. The sealing contact therebetween is made with a substantially annular line contact, which is indicated by the letter A in FIG. With reference to FIG. 3, the center line of the elastomeric bearing ring 82, represented by the dotted line B, is axially displaced from the line A toward the axis of rotation of the disk 28. In fact, the centerline of the elastomer bearing ring 82 lies in a plane perpendicular to the axis passing through the fluid flow passage 22, ie almost parallel to the axis of rotation of the disk 28. In addition, the sealing ring 80 has an annularly extending radially outward groove and complements the bearing ring 82 so that the bearing ring 82 can be stably fitted into the groove 120. It can be seen that. The center line of the groove 120 lies on the surface passing through the center line of the support ring 82. Thus, the bearing ring 82 is asymmetrically positioned with respect to the centerline passing through the body portion 112 of the sealing ring 80, that is, both the grooves 120 and the bearing ring 82 are the disk 28. It will be evident that the shaft is displaced axially toward the axis of rotation. This geometry offers excellent advantages as described below.

Reference is made to FIG. 4 to show the interaction of disk 28 with seat assembly 78 when applying input to disk 28 in the direction indicated by arrow C. FIG. In the position of FIG. 4 where the disk 28 is closed, the pressure acting in the direction of arrow C will displace the disk 28 in the direction of arrow C. FIG. That is, the peripheral sealing surface 29 is forced to interfere, and a relatively large area of contact with the annular sheet surface 122 formed on the sealing ring 80 is forced. In addition, the fluid pressure will enter the valve seat cavity and exert a force on the sealing ring 80 to bring the flange 116 adjacent to the second face 100 of the retaining ring 92 and the body 112. Move adjacent to the flange 102.

5, the interaction of the disk 28 with the valve seat assembly 78 is in conjunction with the fluid pressure acting on the disk 28 in the direction of arrow D, i.e., in the direction toward the axis of rotation of the disk 28. Has been shown in a relationship. Under such conditions of the position where the disk 28 is closed again, the disk 28 will deform towards the axis of rotation of the disk 28, ie in the direction of arrow D. At the same time, the fluid pressure will enter the valve cavity and force the sealing ring 80 to rotate around the support ring 82, resulting in an annular while the line contact between the face 29 and face 122 is still effective. The line contact of is moved axially and passes through the line contact indicated by A and is perpendicular to the axis through which the flow passages 22 parallel to the axis of rotation of the disk 28 pass, ie parallel to the axis of rotation of the disk 28. The face now lies very close to the face passing through the centerline of the backing ring 82. Rotation of the sealing ring 80 around the support ring 82 causes the sealing ring 80 to be skewed or inclined as shown, such that the body 112 is engaged with the flange 104. However, because of the rotational or oscillatory motion of the sealing ring 80 around the support ring 82, the flange portion 114 meets only slightly or none at the back of the recess 106. Thus, the line contact will be maintained under the conditions shown in FIG. 5, with an effective fluid pressure seal, but because of this line contact, the torque for mounting and removing the disk 28 is kept to a minimum. Although the face 122 of the sealing ring 80 is shown round, it can be seen that line contact can still be achieved if the face 122 is frustoconical because the face 29 on the disc 28 is round. have. It should be noted that the backing ring 82, which is a relatively soft and elastomeric material, always maintains an effective seal between the sealing ring 80 and the valve body 10.

As mentioned above, the sealing ring 80 is made of elastic plastic material such as certain rubbers, Teflon, nylon, and the like. The backing ring 82 is generally made of a softer elastic material than the sealing ring 80, for example, a known elastomeric material used to form a particular rubber or other 0-ring or the like.

Obviously, various modifications and variations are possible within the scope of the above technical idea. It is, therefore, to be understood that the invention may be practiced within the scope of the claims set out otherwise than as described herein.

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Claims (9)

In the valve, A valve body having a first end, a second end, and a through hole defining a fluid flow passage, the wall comprising a wall surrounding a portion of the fluid flow passage, the valve body defining an axis coaxial with the wall; A valve element rotatably mounted in the valve body, the valve element having an annular round sealing surface and rotatable about a second axis perpendicular to the first axis; The valve seat assembly located in the valve body for sealing engagement with the sealing surface of the valve element and displaced axially from the second axis towards the first end; And Retention means for retaining the valve seat assembly in the valve body, wherein the valve seat assembly comprises: It is formed of an elastic plastic material, and has an annular radially inward first surface and an annular radially outward second surface for sealingly engaging with the sealing surface on the valve element, in which the radially outwardly annular groove is formed. Seal ring, Disposed in the groove, having a circular cross section and having a centerline formed by a first surface penetrating the center of the bearing ring perpendicular to the first axis, the valve element being in a closed position and the valve element When there is no fluid pressure acting on the engagement of the sealing surface on the valve element and the first surface on the sealing ring is a substantially annular line contact, the line contact engagement is directed toward the first end of the valve body. And an elastomeric bearing ring lying within the second surface axially displaced from the first surface in a direction away from the second axis. The method of claim 1, And the radially outwardly annular groove has a cross-sectional shape complementary to the shape of the cross-sectional setting of the support ring. The method of claim 1, Said valve body and said retaining means together forming an annularly extending valve seat cavity for receiving said valve seat assembly. The method of claim 3, The valve seat cavity has an annular axially facing first recess and an axially facing second recess, when viewed in cross section, the first recess facing the first end of the valve body, And a second recess toward said first recess, said valve cavity comprising a channel extending annularly and intersecting said first and second recesses and opening into said flow passage. The method of claim 4, wherein And the first recess has a radial width less than the radial width of the second recess. The method of claim 5, The sealing ring includes a central body accommodating in the channel, a first flange portion integral with the body portion and extending into the first recess, and a second flange portion extending into the second recess and integral with the body portion. And the body portion and the first and second flanges together form the second surface. The method of claim 5, And the central body portion, the first flange portion and the second flange portion are shaped and dimensioned to fit into the channel, the first recess and the second recess without gaps, respectively. The method of claim 7, wherein The outwardly facing groove in the second face has a centerline lying on the first face, the first face being located from the centerline of the body portion lying in a third face parallel to the first face and the second face. A valve, characterized in that the displacement in the axial direction toward the first axis. The method of claim 1, The first surface on the sealing ring is rounded.